{
  "manageEntity": {
    "action": "Save",
    "entityId": "1503708569",
    "entityType": "Track",
    "nonce": "0xd984a14779f80bd0e40aced225f8ee642fb06d851fcb0009d1441e561746dfde",
    "signature": "0x1ac0527f466a3f995d62639f7de4b5a65270b5849fbab014d1e6cbda9ee7686d0d3e826565297b2e57973649569ac3e6bf0381f3c180fa3526a6262b812d59331c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}